sql query problem

[unix7777]

I want to update a record with this code.Unfortunately the record remains unchanged!

QString name=ui->lineEdit_name->text();
    QString city=ui->lineEdit_city->text();
 
    QSqlQuery query;
    query.prepare("UPDATE clients ClientName="+name+", ClientCity="+city+"WHERE RAWID="+rowid);
    query.exec();

QString name=ui->lineEdit_name->text();
    QString city=ui->lineEdit_city->text();

    QSqlQuery query;
    query.prepare("UPDATE clients ClientName="+name+", ClientCity="+city+"WHERE RAWID="+rowid);
    query.exec();

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What is the reason?Where i make mistake?